Move old upgrade notes into docs/

Changes.md

@@ -523,7 +523,7 @@ Sidekiq::Middleware::Server::Logging -> Sidekiq::JobLogger
 - The `SomeWorker.set(options)` API was re-written to avoid thread-local state. [#2152]
 - Sidekiq Enterprise's encrypted jobs now display "[encrypted data]" in the Web UI instead
   of random hex bytes.
-- Please see the [5.0 Upgrade notes](5.0-Upgrade.md) for more detail.
+- Please see the [5.0 Upgrade notes](docs/5.0-Upgrade.md) for more detail.
 
 4.2.10
 -----------
@@ -741,7 +741,7 @@ Sidekiq::Queues.clear_all
 - Sidekiq's internals have been completely overhauled for performance
   and to remove dependencies.  This has resulted in major speedups, as
   [detailed on my blog](http://www.mikeperham.com/2015/10/14/optimizing-sidekiq/).
-- See the [4.0 upgrade notes](4.0-Upgrade.md) for more detail.
+- See the [4.0 upgrade notes](docs/4.0-Upgrade.md) for more detail.
 
 3.5.4
 -----------
@@ -1008,7 +1008,7 @@ sidekiq_options :dead => false, :retry => 5
 3.0.0
 -----------
 
-Please see [3.0-Upgrade.md](3.0-Upgrade.md) for more comprehensive upgrade notes.
+Please see [3.0-Upgrade.md](docs/3.0-Upgrade.md) for more comprehensive upgrade notes.
 
 - **Dead Job Queue** - jobs which run out of retries are now moved to a dead
   job queue.  These jobs must be retried manually or they will expire
@@ -1052,7 +1052,7 @@ Sidekiq::Client.via(ConnectionPool.new { Redis.new }) do
 end
 ```
   **Sharding support does require a breaking change to client-side
-middleware, see 3.0-Upgrade.md.**
+middleware, see docs/3.0-Upgrade.md.**
 - New Chinese, Greek, Swedish and Czech translations for the Web UI.
 - Updated most languages translations for the new UI features.
 - **Remove official Capistrano integration** - this integration has been

Ent-Changes.md

@@ -92,8 +92,7 @@ sidekiq.latency.#{name} -> sidekiq.queue.latency with tag queue:#{name}
 2.0.0
 -------------
 
-- Except for the [newly required credentials](https://github.com/mperham/sidekiq/issues/4232), Sidekiq Enterprise 2.0 does
-  not have any significant migration steps.
+- Except for the [newly required credentials](https://github.com/mperham/sidekiq/issues/4232), Sidekiq Enterprise 2.0 does not have any significant migration steps.
 - Sidekiq Enterprise must now be started with valid license credentials. [#4232]
 - Call `GC.compact` if possible in sidekiqswarm before forking [#4181]
 - Changes for forward-compatibility with Sidekiq 6.0.

Pro-Changes.md

@@ -111,7 +111,7 @@ job.WorkerName.failure -> job.failure with tag worker:WorkerName
 
 - There is no significant migration from Sidekiq Pro 4.0 to 5.0
   but make sure you read the [update notes for Sidekiq
-6.0](https://github.com/mperham/sidekiq/blob/master/6.0-Upgrade.md).
+6.0](https://github.com/mperham/sidekiq/blob/master/docs/6.0-Upgrade.md).
 - Removed various deprecated APIs and associated warnings.
 - **BREAKING CHANGE** Remove the `Sidekiq::Batch::Status#dead_jobs` API in favor of
   `Sidekiq::Batch::Status#dead_jids`. [#4217]
@@ -161,7 +161,7 @@ batch.on(:death, ...)
 4.0.0
 ---------
 
-- See the [Sidekiq Pro 4.0](Pro-4.0-Upgrade.md) release notes.
+- See the [Sidekiq Pro 4.0](docs/Pro-4.0-Upgrade.md) release notes.
 
 
 3.7.1
@@ -406,7 +406,7 @@ end
 3.0.0
 -----------
 
-- See the [Pro 3.0 release notes](Pro-3.0-Upgrade.md).
+- See the [Pro 3.0 release notes](docs/Pro-3.0-Upgrade.md).
 
 2.1.3
 -----------
@@ -500,7 +500,7 @@ mount Sidekiq::Pro::Web.with(redis_pool: POOL2), at: '/sidekiq2', as: 'sidekiq2'
 2.0.0
 -----------
 
-- See [the Upgrade Notes](Pro-2.0-Upgrade.md) for detailed notes.
+- See [the Upgrade Notes](docs/Pro-2.0-Upgrade.md) for detailed notes.
 
 1.9.2
 -----------